VO$_{2}$ Semishells/Au Nanohemispheres Hybrid Nanostructure with Tunable Optical Property

Vanadium dioxide (VO$_{2})$ has been drawing much attention due to its unique property of a reversible phase transition accompanying significant changes in electrical and optical properties. In addition, the optical property of VO$_{2}$ can be tuned by depositing metal on the VO$_{2}$, and thus VO$_{2}$-metal hybrid structures have been intensively studied to develop smart materials with tunable optical properties. Herein, we developed hybrid nanostructures based on VO$_{2}$ semishells (SSs) and Au nanohemispheres (NHs) as tunable plasmonic nanostructures. The hybrid structure exhibited an enhanced optical absorbance compared to that of the VO$_{2}$ SSs alone, which could be attributed to a strong plasmonic coupling between VO$_{2}$ SSs and Au NHs. Furthermore, the positions of peaks in their absorbance spectra can be adjusted by controlling temperatures, presumably due to the phase transition of the VO$_{2}$ SS structures. Our hybrid nanostructures with tunable optical properties can be useful for various optoelectronic applications such as photothermal nanoregulators and ultrafast optical switches